Crossword Genius

Faulty, ineffectual (3)

Ross

I believe the answer is:

dud

I believe this is a double definition.

'faulty' is the first definition.
(I've seen this before)

'ineffectual' is the second definition.
(I've seen this before)

(Other definitions for dud that I've seen before include "Firework not going up" , "(Explosive) failure" , "Not functioning" , "Just a palindromic flop" , "Faulty" .)

I've seen this clue in The Times.
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